Consideration of Tech-Innovation in State-Owned Enterprises

 

CAI Hui-xing

(Shanghai Ship and Shipping Research Institute, Shanghai 200135, China)

 

Abstract: As Science and technology constitute the primary productive force, Tech-Innovation has been given a new historical mission under the circumstance that Innovation-Driven Development Strategy is promoted by the Chinese Government. This paper elaborates the importance of Tech-Innovation for the state-owned enterprises, points out the existing deficiencies of Tech-Innovation, and presents the considerations and suggestions with six concepts for the state-owned enterprises to think more and to speed up Tech-Innovation, which include the concept of Market, the concept of Chain, the concept of Risk, the concept of Collaboration, the concept of Reform and the concept of Strategy.

Key words:state-owned enterprise; Tech-Innovation; importance; deficiency; consideration and suggestion

 

 

 

Numerical Simulation of the Flow Around Two Columns

with Different Sections

 

GUO Chuan-shan¹，HUANG Wei-ping¹，CAO Shu-gang²，ZHOU Yang³

(1. Shandong Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao 266100, China;

2. The Zhongneng Power Technology Development Co., Ltd., Beijing 100034, China;

3. No.2 Ocean Research Institute of National Bureau of Oceanography, Hangzhou 310012, China)

 

Abstract: In order to observe the similarities and differences of the flow around the two columns respectively with round and square sections, the Fluent software is used to perform numerical simulations of the two columns under different velocities and directions of the incoming current. The result is analyzed and compared in terms of forces on the columns, fluid trace curves, and vortex shedding patterns. It is found that the fluid separation point is fixed for the square column, and the Strouhal value is smaller than that of the round column under the same conditions. Besides, the flow characteristics around the square column vary along with the direction of the incoming current and the statistical values of the fluid forces are also very different from those of the round column, but the relationship of the lift-drag frequencies of the two columns are almost the same.

Key words:round column; square column; flow; numerical simulation

 

 

 

The Impact of UR S11A and UR S34 on the Structure Design of

Ultra Large Container Ship

 

XUYi-gang，HANYu，LI Dan-dan，CHEN Lei

（Marine Design & Research Institute of China, Shanghai 200011, China）

 

Abstract: The UR S11A standard issued by International Association of Classification Societies (IACS) for the global longitudinal strength assessment of container ship is compared with the UR S34 minimum requirements for the finite element strength assessment of container ship, and the differences are mainly found in the global longitudinal strength assessment method, the vertical wave bending moment and the vertical wave shear force equations. Then calculations are performed on the base of two types of ultra large container ship developed by MARIC to analyze the influence of UR S11A on the longitudinal structural component dimensions at 3 typical locations (0.25L, 0.50L and 0.75L), especially the influence on the shear strength. Major contents of UR S34 are also introduced.

Key words:UR S11A; UR S34; container ship; global longitudinal strength; vertical wave bending moment; vertical wave shear force

 

 

 

Analysis on the Critical Buckling Load of Offshore Pipe Structure

under Characteristic Load

 

ZHANG Yong-qiang

（Guangzhou Salvage Bureau of the Ministry of Transport, Guangzhou 510260, China）

 

Abstract: Cylindrical pipe structure is often used in the offshore engineering, therefore its buckling strength under lateral load should be given more attentions at the structure design stage. Theoretical analysis and numerical simulations should be carried out to study the buckling behavior of the cylindrical shell under different radial linear load. Thus the equation for cylindrical shell buckling control could be obtained on the basis of the classical Donnell shell theory, and the critical structural buckling condition is obtained through eigenvalue analysis. It is concluded that the radius thickness ratio is the major influencing factor of the cylindrical shell buckling under linearly varying load and the critical buckling load under triangular radial loading is twice as large as that under uniform radial loading.

Key words:cylindrical shell; buckling; critical buckling load; finite element

 

 

 

Design Optimization for the Spudcan Structure of

Jack-up Service Platform

 

LIU Yu-kun

（Yantai Salvage Bureau of the Ministry of Transport, Yantai 264012, China）

 

Abstract: Spudcan is one of the important structures of jack-up platform, which plays a vital role in the positioning and operation of the platform. Based on the two spudcan structures of the 350ft multi-function jack-up service platform the finite element models are established with MSC-PATRAN & NASTRAN to assess the strength of these two spudcan structures according to ABS regulations, where the weight of the two spudcan structures are also counted. Suggestions on the design optimization are put forward after the calculation results are analyzed and compared.

Key words:jack-up; accommodation platform; spudcan

 

 

 

General Design of the Multi-Functional Survey Vessel

Hai Yang Shi You 707

 

HE Ming-ming，LI Hui，GUI Man-hai

（Shanghai Merchant Ship Design and Research Institute, Shanghai 201203, China）

 

Abstract: As a major ship type of offshore oil and gas exploration, Multi-functional survey vessel has the functions of sample boring, oceanographic investigation and geotechnical exploration. This paper briefly introduces the technical specifications, the general arrangement, the performance and the positioning system of the multi-functional survey vessel. The superstructure of the vessel has been optimized for comfortability to meet the requirement of MLC2006. Some professional devices are equipped to improve the operation capability, including the drilling system, single-beam/multi-beam sub-bottom profiler and current profiler. The dynamic positioning system and four-point mooring system provide the ship with the positioning ability both in deepwater and shallow water. Besides, a series of measures have been taken to improve the ability of the ship as the sea-keeping ability and stability of the ship directly influence the survey operation. Light weight control is also one of the key considerations to guarantee the stability and loading capacity.

Key words:multi-functional survey vessel; drilling and sampling; oceanographic survey; geotechnical exploration; four-points mooring; dynamic positioning

 

 

 

Study on the Hull Form of Hopper Splitter Barge and

Calculation of Its Stability

 

DONG En-chun，JIA Rui

（Jinhai Heavy Industry Co., Ltd., Shanghai 200120, China）

 

Abstract: This paper analyzes in detail the stability difference between the hopper splitter barge and   conventional cargo vessels based on the comparison of the dynamic righting lever (GZ) and displacement variations, where the hull form characteristics of the hopper splitter barge is also taken into account. A theoretical calculation method is specifically proposed according to the characteristics of the hopper splitter barge, which provides theoretical basis and technical reference for the safe operation of hopper splitter barges.

Key words:hopper splitter barge; hull form characteristics; stability calculation; slurry; loam

 

 

 

ANSYS-WORKBENCH Based Load Analysis and

Experimental Study of Winch Drum

 

SUN Kai，LIU Sheng

（Wuhan Marine Machinery Plant Co., Ltd., Wuhan 430084, China）

 

Abstract: According to the actual working conditions of hydraulic tension/anchorage winch, the finite element model of the hydraulic tension/anchorage winch drum is established with ANSYS-WORKBENCH, and the stress-strain is analyzed for two loading conditions, i.e. braking force condition and sustaining load condition. The maximum overall stresses obtained are smaller than the allowed stress of the material, which meets the strength requirement. Meanwhile, the braking force and the sustaining load of the hydraulic tension/anchorage winch are tested with the hydro-cylinder loading method to see if the winch strength and stiffness comply with the requirement. The experiment result shows that the winch drum hasn’t obvious deformation, and there isn’t clamping stagnation in the experiment, so both the strength and stiffness of the winch drum meet the application requirement.

Key words:winch; finite element; braking force; sustaining load; experiment research

 

 

 

Study on the Vibration and Solutions of China¢s First Series of

LNG Carriers

 

ZHU Zhe-ren¹，YUAN Hong-liang²

（1.China LNG Shipping (Holdings) Ltd, Hong Kong SAR. 999077, China；

2. Hudong-zhonghua Shipbuilding (Group) Co., Ltd., Shanghai 200129, China）

 

Abstract: This paper elaborates the reason behind the local vibration of stern and its solutions for China’s first series of large Liquefied Natural Gas (LNG) carriers (1.47×10⁵ m³). Hull appendages (such as the vortex generator) around the engine region are installed to improve the flow passing the propeller and to reduce the propeller exciting forces. Thus, the local vibration at stern is significantly reduced. To solve the vibration problem of new buildings, selection of a correct research plan is the first step, but there are not many options available due to the limitations of time, cost and other conditions. However, the efficiency and correctness of the plan can be effectively improved with underwater imagery, sensor information collection and the simulations based on Computational Fluid Dynamics (CFD). The analysis on the vibration solution for installing and optimizing the vortex generators on LNG carriers would provide references and experience for the solutions of the similar problem.

Key words:large LNG carrier; vibration; CFD analysis; vortex generator

 

 

 

Electrical Design of a LNG Powered5000dwt

Multi-Purpose RORO Vessel

 

XIA Ming-kuan

（Rolls-Royce Marine Manufacturing (Shanghai) Limited, Shanghai 201204, China）

 

Abstract: Taking the world’s first LNG powered 5000dwt multi-purpose pure RORO vessel designed by Rolls-Royce as example, this paper elaborates the electrical system design and the important role that hybrid propulsion system plays in the electrical system. It also introduces the design of the main propulsion remote control system, the automation system and the gas leakage detection and security system. The success of the ship type can provide reference for the electrical design of the similar ships.

Key words:RORO vessel; marine electrics; HSG; LNG powered engine; LNG safety; propulsion control

 

 

 

Research on the Application of Solar Photovoltaic System

onboard 800PCC RO-RO Ship

 

ZOU Li-li

（Bestway Marine & Energy Technology Co., Ltd., Shanghai 201612, China）

 

Abstract: Application of solar energy on ship is an effective way to comply with the environmental requirements, green ship requirements and the situation of energy shortage. This paper introduces the status quo and the relevant regulations of solar energy on ships; analyzes the advantages of solar energy on an 800PCC RO-RO ship, provides the basic parameters and the routes of the ship; and analyzes the structure and operation mode of the solar photovoltaic system on the ship based on the above given information. The potential improvement of energy efficiency by solar energy on the ship is also summarized in the study.

Key words:solar energy; green ship; RO-RO ship; energy efficiency design Index (EEDI)

 

 

 

Research on the Installation of Super Large Stern Door

of 45000t Con-Ro Ship

 

JIANG Zhi-qiang，ZHAO Zhi-hua，YANG Rui-ling

（Hudong-Zhonghua Shipbuilding (Group) Co., Ltd., Shanghai 200129, China）

 

Abstract: The stern door is a watertight device for the large stern opening of the 45000t Con-Ro ship. It consists of the main body and the ro/ro flap which are actuated by the hydro-cylinder with the mode of top lift-up opening. The main body functions as the watertight boundary between the ro/ro cargo space and the external space, while the ro/ro flap functions as the connection between stern ramp and the ro/ro passage way. Under working condition, the ro/ro flap is attached to the stern ramp to ensure that the cars enter the cargo space without hindrance. When the passage way is to be closed, the ro/ro flap is retrieved before the stern door is closed, which makes the surrounding structures recuperated to the normal condition and the passage way kept watertight. This paper mainly studies the installation of the main body, the ro/ro flap and its components, as well as their pre-installation preparations and process control together with the precision control of the stern door in both opening and closing process. The purpose is to achieve the required installation accuracy and reliability which meet the anticipated design requirements, and to provide reference for the stern door installation of the subsequent ships.

Key words:Con-Ro ship; stern door; watertight; hydraulic; accuracy

 

 

 

Pre-research on Heat-Treatment Flatten Method in Duplex Stainless Steel Construction

 

HUANG Yi-ping，LIN Kun

（Hudong-Zhonghua Shipbuilding (Group) Co., Ltd., Shanghai 200129, China）

 

Abstract: Welding deformation of 2205duplex stainless steel often occurs in chemical tanker construction, whereas ship owners are usually opposite to use the method of hot processing for straightening. Thus the oil pump jack-up method and the stiffener pulling method are often used as the option to deal with the deformation of duplex stainless steel in welding though they are rather complicated. This paper introduces the analysis and experiments carried out by Hudong-Zhonghua Shipbuilding (Group) Co., Ltd. to solve the problem of deformation flattening with the heat treatment method for duplex stainless steel and elaborates the key control points. It is expected to provide the pre-theoretical research support for the deformation flattening method in this field.

Key words:duplex stainless steel; heat treatment; deformation; flattening

 

 

 

Special Attention Paid to Monitoring Procedure of

Ship¢s Critical Nodes

 

LI Ke-jie

（Shanghai Branch, NIPPON KAIJI KYOKAI (China) Co., Ltd., Shanghai 200336, China）

 

Abstract: It is necessary to monitor ship’s critical nodes to ensure the effective transfer and release of stress on these nodes. Structural alignment plays a major role in critical node monitoring, which can be realized by using templates and inspection lines. As special attention is paid to the alignment standard, monitoring principles, as well as the inspection environment and locations of the monitored nodes during template usage, the feasibility of the critical nodes monitoring is improved, and a method with improved monitoring accuracy and efficiency is obtained, which can be referred by shipyards to achieve self-monitoring and on-site inspection.

Key words:ship and naval architecture; critical node; structure alignment; monitoring; template; special attention

 

Research on the Simple Transport Device

for Deepwater ROV Tools

 

ZHAO Jie¹，LIU Fu-peng¹，YANG Ning¹，WANG Qing²

（1.Offshore Oil Engineering Company, Tianjin 300461, China;

2. Shanghai Jiao Tong University, Shanghai 200240, China）

 

Abstract: The simple transportation device designed for deepwater Remote Operated Vehicle (ROV) can deploy and recover the samples, instruments, operation equipments and all those ROV cannot carry from/to ocean surface and bottom. Its frame structure consists of the transportation module, the buoyancy adjustment module and the underwater positioning module. The transportation in different water depth is accomplished by carrying buoyancy material of different volumes and loads of different masses. Besides, the device is equipped with an underwater positioning device—acoustic transponder, which can communicate with the mother ship and the ROV through acoustic signals, telling them its location to let them follow.

Key words:ROV tool transportation; underwater tool transportation device; deepwater ROV

 

 

Application and Optimization of SEM System

in the In-house Collaboration Projects

 

SHENG Xing，SONG Rui-peng，LING Bing

（Shanghai Waigaoqiao Shipbuilding & Offshore Co., Ltd., Shanghai 201306, China）

 

Abstract: Enterprise Resource Planning (ERP) is a key component of enterprise development strategy in the information era, where the core is to integrate and optimize all the enterprise resources including manpower, capital, information, materials and technology to improve the capital turnover and storage turnover; reduce production costs and improve production efficiency. Taking the business interaction of three enterprises - Shanghai Waigaoqiao Shipbuilding Co., Ltd, Shanghai Jiangnan-Changxing Heavy Industry Co., Ltd and Shanghai Waigaoqiao Shipbuilding & Offshore Co., Ltd. as the example, this paper studies the logistics collaboration model among the enterprises and analyzes the current status and problems in the collaborative logistics management. It sorts out, defines and optimizes the integration of material and financial management, establishes the material and financial management model in accordance with the enterprise’s situation, builds up and optimizes the cross-company and cross-region integrated information platform, i.e. the Shipbuilding Enterprise Management (SEM) system.

Key words:Enterprise Resource Planning (ERP); process optimization; integration